aswhile的区别和用法

　　I was eighteen when I got my driving license.

　　我拿到驾照时才十八岁。

　　She was twenty-one when she got married.

　　她结婚时才二十一岁。

　　I loved history when I was at school.

　　我上学时喜欢历史。

　　when she came into my room I was just reading a book.

　　她走进我房间时，我正在看书。

　　Sorry, I was out when you called me.

　　对不起，你打电话来的时候我出去了。

　　When I got to the airport, the guests had left.

　　当我赶到飞机场时，客人们已经离开了。

　　When he had finished his homework, he took a short rest．

　　当他完成作业后，他休息了一会儿。

　　Why do you want a new job when you have got such a good one already？

　　你已经找到如此好的.工作，为何还想再找新的？

　　You shall borrow the book when I have finished reading it.